I just learned that perlbrew use XXX will look for an install named perl-XXX if it doesn't find one named XXX, so omitting the leading perl- in the name isn't critical. (It's surely the same thing for perlbrew switch.)
Re^5: App::perlbrew - Compiling Perl with thread support
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I had a very brief look at the App::perlbrew code. The perl- prefix relates to CPAN URLs, e.g. http://search.cpan.org/dist/perl-5.14.2/. I haven't dug any deeper than this but probably will do next week: there's still a few outstanding question marks.
I've successfully compiled 5.14.2 with threads and tested my frequently used apps. I skipped the alias step: it isn't strictly necessary and I want to find out a bit more about it anyway (e.g. I still don't know what the -f option does).